Flood events in Grundy County, Iowa The flood events on record, by date and by year
This page is a county record of past events and claims. It does not show the flood zone or the risk of an address. For the flood map of an address, use FEMA's address search (opens in a new tab).
NCEI has 56 flood events on record for Grundy County, Iowa, from 1996 through 30 Jun 2026.
The newest flood event on record is on 21 May 2024.
From 2016 through 2025, NCEI has 7 flood events on record for the county.
The NWS collects event reports from a variety of sources, which include (but are not limited to): county, state, and federal emergency management officials, local law enforcement officials, SKYWARN spotters, NWS damage surveys, newspaper clipping services, the insurance industry, and the general public, among others.
The National Weather Service reports property and crop damage estimates using available data at the time of event reporting. These values should therefore be considered broad estimates. Damage amounts are not adjusted for inflation.
Zone (NWS Forecast Zone): A zone is a geographic area defined by the NWS for issuing forecasts, watches, and warnings. While zones often align with counties, they can also represent smaller or subdivided areas within a county to account for differences in weather conditions, such as elevation or proximity to water. Larger-scale events—such as heat, cold, drought, and winter storms—are typically recorded by zone.
The words of the agency. Source: NOAA NCEI, Storm Events Database, page "Frequently Asked Questions", copied on .
Date of the data: NCEI storm events through . Event types on this page: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
Newest flood events on record
Flash Flood
5 miles NNW of WELLSBURG
Flash Flood
5 miles NW of WELLSBURG
Flood
1 mile W of CONRAD
Flood
1 mile NW of REINBECK
Flood
10 miles NW of WELLSBURG. Damage estimate: $100 thousand
Flood
2 miles NNE of DIKE. Damage estimate: $50 thousand
Flood
4 miles N of FREDSVILLE. Damage estimate: $600 thousand
Flood
3 miles NW of WELLSBURG. Damage estimate: $100 thousand
Flood
6 miles NW of WELLSBURG. Damage estimate: $100 thousand
Flash Flood
2 miles N of WELLSBURG. Damage estimate: $10 thousand
Flash Flood
2 miles N of WELLSBURG. Damage estimate: $100 thousand
Flash Flood
1 mile NNW of BEAMAN THURMAN ARPT. Damage estimate: $100 thousand
Flash Flood
At REINBECK. Damage estimate: $50 thousand
Flash Flood
2 miles WNW of WELLSBURG. Damage estimate: $200 thousand
Flood
3 miles S of MORRISON. Damage estimate: $250 thousand
Flash Flood
At HOLLAND. Damage estimate: $450 thousand
Flash Flood
1 mile NNW of WELLSBURG. Damage estimate: $25 thousand
Flash Flood
2 miles SE of IVESTER. Damage estimate: $50 thousand
Flash Flood
3 miles NW of FERN. Damage estimate: $10 thousand
Flash Flood
6 miles NW of FERN. Damage estimate: $25 thousand
Flood
11 miles NNW of WELLSBURG. Damage estimate: $20 million
Flood
10 miles NNW of WELLSBURG. Damage estimate: $150 thousand
Flash Flood
3 miles NW of WELLSBURG. Damage estimate: $10 thousand
Flash Flood
1 mile W of REINBECK. Damage estimate: $10 thousand
Flood
3 miles NNW of HOLLAND. Damage estimate: $25 thousand
A place is the text of the NCEI record: a distance and a direction from a reference place. The site does not show a place text that names a private property or reads as a person. NCEI gives no magnitude for this hazard.
Flood events by year
| Decade | Year that ends in 0 | Year that ends in 1 | Year that ends in 2 | Year that ends in 3 | Year that ends in 4 | Year that ends in 5 | Year that ends in 6 | Year that ends in 7 | Year that ends in 8 | Year that ends in 9 | All |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1960s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1970s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1980s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1990s | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 4 | 6 | 15 |
| 2000s | 6 | 4 | 0 | 1 | 2 | 2 | 0 | 1 | 4 | 0 | 20 |
| 2010s | 3 | 0 | 0 | 5 | 2 | 4 | 0 | 0 | 2 | 1 | 17 |
| 2020s | 2 | 0 | 0 | 0 | 2 | 0 | 0 (part of the year) | 4 |
A darker cell has a larger count. The number is in each cell.
Flood and flash flood events are on record from 1996. The year 2026 has the events through 30 Jun 2026 only.
By month, all years
- Jan0 events
- Feb1 event
- Mar5 events
- Apr3 events
- May11 events
- Jun21 events
- Jul7 events
- Aug6 events
- Sep0 events
- Oct1 event
- Nov0 events
- Dec1 event
Beside the other counties
| Measure | Grundy | All counties of Iowa | All counties of the United States |
|---|---|---|---|
| Flood events, 1996 to 2026 | 56 | 7,383 | 177,902 |
| Events for each 100 square miles | 11.2 | 13.2 | 5.0 |
| Events for each 10,000 residents | 45.4 | 23.1 | 5.4 |
The columns for the state and the United States total the counties. They count the events of each county in the same way as the county column. A forecast zone with another name than a county counts for the state only.
More flood events on record
| Date | Event type | Magnitude | Damage estimate | Deaths | Injuries | On record for |
|---|---|---|---|---|---|---|
| Flash Flood | not recorded | $350 thousand | 0 | 0 | County | |
| Flood | not recorded | $40 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $124 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $20 thousand | 0 | 0 | County | |
| Flood | not recorded | $398 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $35 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $75 thousand | 0 | 0 | County | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $8 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $75 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $450 thousand | 0 | 1 | County | |
| Flood | not recorded | $125 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $70 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $50 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $15 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $175 thousand | 0 | 0 | County | |
| Flood | not recorded | $10 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $125 thousand | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | $550 thousand | 0 | 0 | County | |
| Flood | not recorded | $60 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $225 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $150 thousand | 0 | 0 | Forecast zone | |
| Flood | not recorded | $60 thousand | 0 | 0 | County | |
| Flood | not recorded | $33 thousand | 0 | 0 | County | |
| Flood | not recorded | $55 thousand | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone |
The table has all other events on record. A damage figure is an estimate in the NCEI record.
Official channels
- NCEI Storm Events Database (opens in a new tab)Search the full NCEI record by state, county and date.
- National Weather Service: Des Moines, IA (opens in a new tab)The forecast office that issues the weather warnings for the county.
- FEMA Flood Map Service Center: Search By Address (opens in a new tab)Search an address to see its flood map. This site has no flood-zone data.
These links open the pages of the agencies. The site checked the links on .
Cite this page
County Hazards. "Flood events on record for Grundy County, Iowa". https://countyhazards.com/county/ia/grundy/flood/. Data: NOAA NCEI Storm Events Database through 30 Jun 2026. Page made on .
Questions
- Which month has the most flood events on record for Grundy County?
- June has 21 of the 56 flood events on record from 1996 through 30 Jun 2026.
- How many flood events are on record for Iowa?
- NCEI has 7,383 flood events on record for Iowa from 1996 through 30 Jun 2026. That count has every forecast zone of the state.
- How does Grundy County compare with the other counties of Iowa?
- The counties of Iowa have 13.2 flood events for each 100 square miles. Grundy County has 11.2.
- Why are some flood events on record for a forecast zone?
- NCEI records some event types for a National Weather Service forecast zone and not for a county. This page counts a zone event when the zone has the name of the county.